// a self-executing anonymous function
(function() {
    var baz = 1;
    var bim = function() { alert(baz); };
    bar = function() { alert(baz); };
})();

console.log(baz);  // baz is not defined outside of the function

bar();  // bar is defined outside of the anonymous function 
        // because it wasn't declared with var; furthermore,
        // because it was defined in the same scope as baz,
        // it has access to baz even though other code
        // outside of the function does not

bim();  // bim is not defined outside of the anonymous function,
        // so this will result in an error